公开(公告)号：US11648608B1

公开(公告)日：2023-05-16

申请号：US17897257

申请日：2022-08-29

Applicant: University of Science and Technology Beijing

Inventor： Qing Liu ,  Leilei Zou ,  Jiangshan Zhang ,  Huisheng Wang ,  Biao Tao

IPC: B22D11/22 ,  C21D6/02 ,  B22D11/00

CPC classification number: B22D11/225 ,  B22D11/001 ,  C21D6/02

Abstract: A secondary cooling control method for reinforcing surface solidification structure of microalloyed steel continuous casting bloom includes: in situ observing precipitation behavior of secondary phase particles of the microalloyed steel, and determining a concentrated precipitation temperature range; cooling the microalloyed steel at different cooling rates, obtaining a particle size and a volume fraction of the secondary phase particles of the microalloyed steel at different cooling rates; determining an optimal average cooling rate; determining an optimal average cooling rate r; determining an optimal average cooling rate; and determining an optimal average cooling rate range through intersection of the three optimal average cooling rates whereby the continuous casting secondary cooling is optimized. The present invention can enhance the surface solidification structure of continuous casting bloom and reduce surface and subsurface cracks of the microalloyed steel continuous casting bloom.